| 摘要 |
The disclosed signal generating apparatus and method is suitable for use in combination with a PM receiver to provide a standby signal for a signal processor. The standby signal system includes a clipper connected to the receiver IF; a coherent amplitude detector coupled between the clipper and a gain controlled amplifier; and a trigger circuit coupled between the coherent amplitude detector and the signal processor. The trigger circuit provides a standby signal in response to the level of the output signal of the coherent amplitude detector passing through a predetermined threshold level in response to the clipper limiting on a selected signal-to-noise ratio which occurs before the information signal becomes undesirably weak.
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